我想用lavaan包建结构方程模型：
数据处理：
a<-read.csv("N:/r data/scale3-1.csv")
is.data.frame(a)
a1<-a
a1[,2:15]<-lapply(a1[,2:15],ordered)
a2<-na.omit(a1)

这些都没有问题
当利用数据框建模时
library(lavaan)
au.model<-
'
expr1=~rex+patent+sinov
lc=~gwage+welfare+train+security            
expr1~lc+cfin+intype+inculture
lc~mw+rmw+informal
'
fit<-sem(au.model,data=a2,estimator="PML")
summary(fit,fit.measures=TRUE)

这里有错误提示：
Error in X[[g]][, idx2] : subscript out of bounds
In addition: Warning message:
In lav_data_full(data = data, group = group, cluster = cluster,  :
  lavaan WARNING: exogenous variable(s) declared as ordered in data: cfin intype inculture rmw informal
> summary(fit,fit.measures=TRUE)
Error in summary(fit, fit.measures = TRUE) : object 'fit' not found

没有任何结果了，被这个问题困扰多时，请高手指教！先谢谢了！